Design, Synthesis and Characterizations of Non-Fullerene Acceptors for Organic Photovoltaics

Date

2024-1-25

Author

Balcı, Seher

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Non-fullerene acceptors (NFAs) have garnered significant attention for their capacity to enhance the power conversion efficiency (PCE) of organic photovoltaics (OPVs). NFAs possess tunable energy levels, intense light absorption capabilities, stability, and ease of purification, all of which have contributed to the advancement of OPVs. Recent studies have demonstrated that NFA-based OPVs have achieved PCEs exceeding 18%, owing to the cutting-edge design of NFA molecules based on the Acceptor-Donor-Acceptor (A-D-A) approach. This approach facilitates the creation of efficient OPVs with higher open-circuit voltage (VOC) and reduced voltage loss. In this study, non-fullerene acceptors were meticulously designed and synthesized following the A-D-A design paradigm to enhance photovoltaic properties and consequently achieve high power conversion efficiencies. The structural elucidation of the synthesized molecules will be conducted using Nuclear Magnetic Resonance (NMR) Spectroscopy and High-Resolution Mass Spectrometry (HRMS). Electrochemical and optical studies were conducted utilizing techniques such as Cyclic Voltammetry (CV) and UV-Vis Spectrophotometry. Subsequently, the synthesized small molecules were employed as acceptors in the active layer of OPVs. Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM) analyses will be carried out to characterize the morphological features of these OPV active layers. By employing this comprehensive approach, this study aims to contribute to the advancement of OPVs and facilitate the development of efficient and sustainable solar energy technologies through the strategic design of non-fullerene acceptors.

Subject Keywords

Carbazole, Fluorene, Silafluorene, Benzothiadiazole, Rhodanine, Non-fullerene Acceptors, Organic Photovoltaics

URI

https://hdl.handle.net/11511/108816

Collections

Graduate School of Natural and Applied Sciences, Thesis